@article{IM_1989__97_2_143699,
     author = {William M. McGovern},
     title = {Rings of regular functions on nilpotent orbits and their covers.},
     journal = {Inventiones mathematicae},
     pages = {209--218},
     publisher = {mathdoc},
     volume = {97},
     number = {2},
     year = {1989},
     zbl = {0648.22004},
     url = {http://geodesic.mathdoc.fr/item/IM_1989__97_2_143699/}
}